In Chevallet fracture of nasal bone, the mechanism of trauma is -a) Blow from sideb) Blow from below c) Blow directly from front d) Any of the above

**Core Concept**
A Chevallet fracture of the nasal bone is a specific type of fracture that occurs due to a direct blow to the nose, resulting in a fracture of the nasal bone. This type of fracture is characterized by a transverse fracture line across the nasal bone.

**Why the Correct Answer is Right**
The correct answer is due to the direct force applied to the nose, which causes a fracture of the nasal bone. This type of fracture occurs when there is a sudden and direct impact to the nasal area, resulting in a break in the bone. The force is transmitted directly to the nasal bone, causing it to fracture. The nasal bone is a thin, flat bone that is susceptible to fractures from direct blows.

**Why Each Wrong Option is Incorrect**
* **Option A:** A blow from the side would not typically result in a Chevallet fracture, as the force would be more likely to cause a lateral or oblique fracture.
* **Option B:** A blow from below would not typically result in a Chevallet fracture, as the force would be more likely to cause a depression or a fracture of the nasal septum.
* **Option D:** While a Chevallet fracture can occur from any type of trauma, the correct answer is a blow directly from the front, which is the most specific and characteristic mechanism of trauma for this type of fracture.

**Clinical Pearl / High-Yield Fact**
A Chevallet fracture is often associated with a "butterfly" deformity of the nasal bone, where the nasal bone is fractured in a transverse line, resulting in a characteristic "butterfly" shape.

**Correct Answer: C. Blow directly from front**